If you've been keeping an eye on these things, you'll have noticed that there's an update for FTB. It looks like, after a little more patching, it's stable now. I'm going to do some more testing over the weekend, but it looks like an update to Serenity is imminent. Baring any problems in testing, I'm looking at updating Serenity around 9 AM NSW time on Wednesday (7 PM Eastern, 4 PM Pacific, Tuesday, in North America) .
This update is a 1.4.7 build, and is an update/bugfix for the current release.

There is still no new stable build for Bukkit, so Frontier/Sanctuary is going to have to hang out as is for the time being, but I'm paying close attention, and we'll get that updated when the new version is stable.

yes it is unfortunately. It will mean the matter fab will work at a snails pace.
According to the patch notes he changes it from any amount of eu @8192eu packet size per side to a maximum of 8192eu per tick (any packet size upto 8192). So at the moment the matter fab has approximately 290000eu per tick in packets of 8192..... this wil dramatically nerf the matter fab.
Changed:
Nerfed the Matter Fabricator to a maximum of 8192EU/t instead of 1000000, unless the regular Massfab is enabled.
Changed a few Recipes. Windmills and Watermills are now made in the Assembler.
Changed the Texture of the Advanced Safe, to look more safely. (what a pun)
I changed tons of Crafting Recipes, including Mixed Metal Ingots, Dense Copper Plates and almost every Machine. I won't add any Config to revert that massive change!
Compasses and Clocks are now craftable inside an Assembler.
Copying of Maps inside the printer is now possible (I know you can still craft copies, but hey! A printer is so much cooler)
Creating Maps inside a printer with compass and 8 Paper is now also possible.
Changed MMIngot Recipes.
Broke old Advanced Configs completly by letting OreDictUnification run over the ItemNames (its now much better readable)
UUM-Recipes now use the Advanced Config. Some Recipes have been slightly changed, and the Snowlayers got removed due to the upcoming 1.5-Update making them craftable.
Changed Plutonium and Thorium Cells, now using the multipulse System (and nerfed Thorium by 50% Lifetime).

In light of the above fact, I have already adjusted the energy requirement to create UU in the server config. A fully powered matter fab under the new limit produces UU at almost the same rate as before. We have already tested this on Serenity.

Thanks for All The Work and Effort Irimar. I have been a LITTLE stressed by the costs of recipes. It will take me a while to build a decent kit. I will just have to adapt again. I hope everything goes smoothly. Good Luck